ad525x_dpot: add support for SPI parts

[pandora-kernel.git] / drivers / misc / ad525x_dpot-i2c.c

diff --git a/drivers/misc/ad525x_dpot-i2c.c b/drivers/misc/ad525x_dpot-i2c.c
new file mode 100644 (file)
index 0000000..971e61d
--- /dev/null
+++ b/drivers/misc/ad525x_dpot-i2c.c
@@ -0,0 +1,119 @@
+/*
+ * Driver for the Analog Devices digital potentiometers (I2C bus)
+ *
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+
+#include "ad525x_dpot.h"
+
+/* ------------------------------------------------------------------------- */
+/* I2C bus functions */
+static int write_d8(void *client, u8 val)
+{
+       return i2c_smbus_write_byte(client, val);
+}
+
+static int write_r8d8(void *client, u8 reg, u8 val)
+{
+       return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static int write_r8d16(void *client, u8 reg, u16 val)
+{
+       return i2c_smbus_write_word_data(client, reg, val);
+}
+
+static int read_d8(void *client)
+{
+       return i2c_smbus_read_byte(client);
+}
+
+static int read_r8d8(void *client, u8 reg)
+{
+       return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int read_r8d16(void *client, u8 reg)
+{
+       return i2c_smbus_read_word_data(client, reg);
+}
+
+static const struct ad_dpot_bus_ops bops = {
+       .read_d8        = read_d8,
+       .read_r8d8      = read_r8d8,
+       .read_r8d16     = read_r8d16,
+       .write_d8       = write_d8,
+       .write_r8d8     = write_r8d8,
+       .write_r8d16    = write_r8d16,
+};
+
+static int __devinit ad_dpot_i2c_probe(struct i2c_client *client,
+                                     const struct i2c_device_id *id)
+{
+       struct ad_dpot_bus_data bdata = {
+               .client = client,
+               .bops = &bops,
+       };
+
+       struct ad_dpot_id dpot_id = {
+               .name = (char *) &id->name,
+               .devid = id->driver_data,
+       };
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_WORD_DATA)) {
+               dev_err(&client->dev, "SMBUS Word Data not Supported\n");
+               return -EIO;
+       }
+
+       return ad_dpot_probe(&client->dev, &bdata, &dpot_id);
+}
+
+static int __devexit ad_dpot_i2c_remove(struct i2c_client *client)
+{
+       return ad_dpot_remove(&client->dev);
+}
+
+static const struct i2c_device_id ad_dpot_id[] = {
+       {"ad5258", AD5258_ID},
+       {"ad5259", AD5259_ID},
+       {"ad5251", AD5251_ID},
+       {"ad5252", AD5252_ID},
+       {"ad5253", AD5253_ID},
+       {"ad5254", AD5254_ID},
+       {"ad5255", AD5255_ID},
+       {}
+};
+MODULE_DEVICE_TABLE(i2c, ad_dpot_id);
+
+static struct i2c_driver ad_dpot_i2c_driver = {
+       .driver = {
+               .name   = "ad_dpot",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = ad_dpot_i2c_probe,
+       .remove         = __devexit_p(ad_dpot_i2c_remove),
+       .id_table       = ad_dpot_id,
+};
+
+static int __init ad_dpot_i2c_init(void)
+{
+       return i2c_add_driver(&ad_dpot_i2c_driver);
+}
+module_init(ad_dpot_i2c_init);
+
+static void __exit ad_dpot_i2c_exit(void)
+{
+       i2c_del_driver(&ad_dpot_i2c_driver);
+}
+module_exit(ad_dpot_i2c_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("digital potentiometer I2C bus driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i2c:ad_dpot");